<template>
  <div>
    <!--    面包屑导航区-->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/welcome' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>参数列表</el-breadcrumb-item>
    </el-breadcrumb>

    <!--卡片视图-->
    <el-card>
      <!---头部警告区域-->
      <el-alert show-icon title="注意：只允许为第三级分类设置相关参数！！！"
                type="warning" :closable="false"></el-alert>
      <!--选择商品分类区-->
      <el-row class="cat_opt">
        <el-col>
          <span>选择商品分类:</span>
          <!--选择商品分类的级联选择框-->
          <el-cascader expand-trigger="hover" :options="cateList"
                       :props="cateProps" v-model="selectedCateKeys"
                       @change="handleChange"></el-cascader>
        </el-col>
      </el-row>
      <!--tab叶签区-->
      <el-tabs v-model="activeName" @tab-click="handleTabClick">
        <!--动态参数的面板-->
        <el-tab-pane label="动态参数" name="many">
          <el-button type="primary" size="mini"
                     :disabled="isBtnDisabled"
                     @click="addDialogVisible = true">添加参数</el-button>
          <!--动态参数表格-->
          <el-table :data="manyTableData" border stripe>
            <!--索引列-->
            <el-table-column type="expand">
              <template slot-scope="scope">
                <!--循环渲染tag标签-->
                <el-tag v-for="(item,i) in scope.row.attr_vals"
                        :key="i"
                        closable
                        @close="handleClose(i,scope.row)">{{item}}</el-tag>
                <!--输入文本框-->
                <el-input
                        class="input-new-tag"
                        v-if="scope.row.inputVisible"
                        v-model="scope.row.inputValue"
                        ref="saveTagInput"
                        size="small"
                        @keyup.enter.native="handleInputConfirm(scope.row)"
                        @blur="handleInputConfirm(scope.row)"
                >
                </el-input>
                <!--添加按钮-->
                <el-button v-else class="button-new-tag" size="small"
                           @click="showInput(scope.row)">+ New Tag</el-button>
              </template>
            </el-table-column>
            <el-table-column type="index"></el-table-column>
            <el-table-column label="参数名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button type="primary"icon="el-icon-edit"size="mini"
                           @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                <el-button type="danger"icon="el-icon-delete"size="mini"
                           @click="removeParams(scope.row.attr_id)">删除</el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
        <!--静态属性的面板-->
        <el-tab-pane label="静态属性" name="only">
          <el-button type="primary" size="mini"
                     :disabled="isBtnDisabled"
                     @click="addDialogVisible = true">添加属性</el-button>
          <!--静态属性表格-->
          <el-table :data="onlyTableData" border stripe>
            <!--索引列-->
            <el-table-column type="expand">
              <template slot-scope="scope">
                <!--循环渲染tag标签-->
                <el-tag v-for="(item,i) in scope.row.attr_vals"
                        :key="i"
                        closable
                        @close="handleClose(i,scope.row)">{{item}}</el-tag>
                <!--输入文本框-->
                <el-input
                        class="input-new-tag"
                        v-if="scope.row.inputVisible"
                        v-model="scope.row.inputValue"
                        ref="saveTagInput"
                        size="small"
                        @keyup.enter.native="handleInputConfirm(scope.row)"
                        @blur="handleInputConfirm(scope.row)"
                >
                </el-input>
                <!--添加按钮-->
                <el-button v-else class="button-new-tag" size="small"
                           @click="showInput(scope.row)">+ New Tag</el-button>
              </template>
            </el-table-column>
            <el-table-column type="index"></el-table-column>
            <el-table-column label="属性名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
<!--                <pre>{{scope.row}}</pre>-->
                <el-button type="primary"icon="el-icon-edit"size="mini"
                           @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                <el-button type="danger"icon="el-icon-delete"size="mini"
                           @click="removeParams(scope.row.attr_id)">删除</el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>

      </el-tabs>
    </el-card>

    <!--添加参数的对话框-->
    <el-dialog
            :title="'添加'+titleText"
            :visible.sync="addDialogVisible"
            width="50%"@close="addDialogClosed">
      <!--添加参数的验证表单-->
      <el-form ref="addFormRef" :model="addForm"
               :rules="addFormRules" label-width="100px">
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="addForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="addDialogVisible = false">取 消</el-button>
        <el-button type="primary"
                   @click="addParams">确 定</el-button>
      </span>
    </el-dialog>
    <!--修改参数的对话框-->
    <el-dialog
            :title="'修改'+titleText"
            :visible.sync="editDialogVisible"
            width="50%"@close="editDialogClosed">
      <!--修改参数的验证表单-->
      <el-form ref="editFormRef" :model="editForm"
               :rules="editFormRules" label-width="100px">
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="editForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="editDialogVisible = false">取 消</el-button>
        <el-button type="primary"
                   @click="editParams">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
  export default {
    name: "params",
    data(){
      return{
        /*商品分类列表*/
        cateList:[],
        /*级联选择框配置*/
        cateProps:{
          value:'cat_id',
          label:'cat_name',
          children:'children'
        },
        /*级联选择看双向绑定到的数组*/
        selectedCateKeys:[],
        /*被激活页签的名称*/
        activeName:'many',
        onlyTableData:[],
        manyTableData:[],
        /*控制添加对话框的显示与隐藏*/
        addDialogVisible:false,
        /*添加参数的表单数据对象*/
        addForm:{},
        /*添加表单的验证规则*/
        addFormRules: {
          attr_name:[
            {required:true,message:'请输入参数名称',trigger:'blur'}
          ]
        },
        /*修改表单验证规则*/
        editFormRules: {
          attr_name:[
            {required:true,message:'请输入参数名称',trigger:'blur'}
          ]
        },
        /*控制修改参数对话框显示与隐藏*/
        editDialogVisible:false,
        /*修改参数的表单数据对象*/
        editForm:{},
        /*接口传递参数*/
        attr_id:''

      }
    },
    created() {
      this.getCateList()
    },
    methods:{
      //获取所有的商品分类列表
      async getCateList(){
        const {data:res} =
            await this.$http.get('categories')
        if(res.meta.status !== 200){
          return this.$message.error('获得商品分类失败')
        }
        this.cateList= res.data
        // console.log(this.cateList)
      },
      /*级联选择框选中变化，触发此函数*/
      handleChange(){
        // console.log(this.selectedCateKeys)
        this.getParamsData()
      },
      /*tab页签点击事件的处理函数*/
      handleTabClick(){
        console.log(this.activeName)
        this.getParamsData()
      },
      async getParamsData(){
        if (this.selectedCateKeys.length !== 3){
          this.selectedCateKeys = []
          this.manyTableData = []
          this.onlyTableData = []
          return
        }
        //证明选中的是三级分类
        console.log(this.selectedCateKeys)
        /*根据所选分类的Id，和当前所处的面板，
        的获取对应的参数*/
        const {data:res} = await this.$http.get(
            `categories/${this.cateId}/attributes`,
            {params:{sel:this.activeName}})
        if (res.meta.status !== 200){
          // console.log(res.meta.status)
          return this.$message.error('获取失败')
        }
        console.log('获取成功')
        /*将res.data中的attr_vals转化为数组*/
        res.data.forEach(item => {
          item.attr_vals = item.attr_vals?item.attr_vals.split(' '):[]
          /*控制文本框隐藏*/
          item.inputVisible = false
          /*文本框中输入的值*/
          item.inputValue =''
        })
        console.log(res.data)
        if(this.activeName == 'many'){
          this.manyTableData = res.data
        }
        else{
          this.onlyTableData = res.data
        }
      },
      /*监听添加参数对话框的关闭事件*/
      addDialogClosed(){
        this.$refs.addFormRef.resetFields()
      },
      /*监听添加参数对话框确定*/
      addParams(){
        this.$refs.addFormRef.validate(async valid => {
          if(!valid)return
          const {data:res} = await this.$http.post(`categories/${this.cateId}/attributes`,
              {attr_name:this.addForm.attr_name,attr_sel:this.activeName})
          if(res.meta.status !== 201)
            return this.$message.error('添加失败')
          this.$message.success('添加成功')
          this.addDialogVisible = false
          this.getParamsData()
        })
      },
      /*点击按钮，展示修改对话框*/
      async showEditDialog(attr_id){
        this.attr_id = attr_id
        const {data:res} = await this.$http.get(
            `categories/${this.cateId}/attributes/${attr_id}`,
            {params:{attr_sel:this.activeName}})
        if(res.meta.status !== 200)
          return this.$message.error('获取失败')

        this.editForm = res.data
        this.editDialogVisible = true
      },
      /*点击关闭按钮，复原修改对话框*/
      editDialogClosed(){
        this.$refs.editFormRef.resetFields()
      },
      /*点击按钮，修改参数*/
      editParams(){
        this.$refs.editFormRef.validate(async valid => {
          if(!valid)return
          const {data:res} = await this.$http.put(
              `categories/${this.cateId}/attributes/${this.editForm.attr_id}`,
              {attr_name:this.editForm.attr_name,attr_sel:this.activeName})
          if(res.meta.status !== 200)
            return this.$message.error('修改失败')
          this.$message.success('修改成功')
          this.getParamsData()
          this.editDialogVisible = false
        })
      },
      /*根据id删除参数*/
      async removeParams(attr_id){
        const confirmResult = await this.$confirm('此操作将永久删除该参数, 是否继续?', '提示', {
          confirmButtonText: '确定',
          cancelButtonText: '取消',
          type: 'warning'
        }).catch(err => err)

        if(confirmResult !== 'confirm'){
          return this.$message.info('取消了删除操作')
        }
        else{
          const {data:res} = await this.$http.delete
          (`categories/${this.cateId}/attributes/${attr_id}`)
          if(res.meta.status !== 200)
            return this.$message.error('删除失败')
          this.$message.success('删除成功')
          this.getParamsData()
        }
      },
      /*文本框失去焦点或点击enter键都会触发*/
      handleInputConfirm(row){
        console.log('ok')
        if(row.inputValue.trim().length === 0){
          row.inputValue = ''
          row.inputVisible = false
          return
        }
        /*证明用户输入了内容*/
        row.attr_vals.push(row.inputValue.trim())
        row.inputValue = ''
        row.inputVisible = false
        this.saveAttrVals(row)
      },
      /*将对attr_vals的操作保存到数据库*/
      async saveAttrVals(row){
        /*需要发起请求，保存操作*/
        const {data:res} = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`
            ,{
              attr_name:row.attr_name,
              attr_sel:row.attr_sel,
              attr_vals:row.attr_vals.join(' ')})
        if(res.meta.status !== 200){
          return this.$message.error('操作失败')
        }
        this.$message.success('操作成功')
      },
      /*点击按钮，现实文本输入框*/
      showInput(row){
        row.inputVisible = true
        /*让文本框自动获得焦点
        * $nextTick当页面上元素被重新渲染之后，
        * 进行调用内部指定的函数*/
        this.$nextTick(_ => {
          this.$refs.saveTagInput.$refs.input.focus();
        });
      },
      /*删除对应参数和选项*/
      handleClose(i,row){
        row.attr_vals.splice(i,1)
        this.saveAttrVals(row)
      }
    },
    /*计算属性*/
    computed:{
      /*如果按钮需要被禁用，则返回true，否则，返回false*/
      isBtnDisabled(){
        if(this.selectedCateKeys.length !== 3){
          return true
        }
        return false
      },
      /*当前选中的三级分类的Id*/
      cateId(){
        if(this.selectedCateKeys.length === 3){
          return this.selectedCateKeys[2]
        }
        return null
      },
      /*动态计算标题的文本*/
      titleText(){
        if(this.activeName === 'many'){
          return '动态参数'
        }
        return '静态属性'
      }
    }
  }
</script>

<style lang="less" scoped>
.cat_opt{
  margin:15px 0;
}
.input-new-tag{
  width:120px;
}
</style>